Cake bubble machine



FIG. 1 is a top left perspective view of the cake bubble machine showing our new design;

FIG. 2 is a top right perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a left side elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines depict the portions of the cake bubble machine that form no part of the claimed design. 

CLAIM The ornamental design for cake bubble machine, as shown and described. 